Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 2 and no antidiagonal sum 2 and no row sum 0 and no column sum 0.
A255786
Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 2 and no antidiagonal sum 2 and no row sum 0 and no column sum 0.
Terms
- a(0) =177a(1) =270a(2) =491a(3) =884a(4) =1696a(5) =3376a(6) =6668a(7) =13654a(8) =28636a(9) =60436a(10) =129004a(11) =277490a(12) =598982a(13) =1298324a(14) =2822028a(15) =6143688a(16) =13394892a(17) =29231560a(18) =63828278a(19) =139443252a(20) =304733610a(21) =666090304a(22) =1456209450a(23) =3183921392a(24) =6961973124a(25) =15224014438a(26) =33292204686
External references
- oeis: A255786